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The 4100's come with a 12 month warranty. I'm not sure what the warranty is on the 5000 series, I'll double check that. These are race style dampers, and although many of the kits are fully TUV tested and approved for street use, customers use them for HPDE, autocross and race events.
These are not an uprated street damper based off the oem shock design. These are pure race breed components.
Dampers like AST, JRZ, Ohlins, and Moton get re-valved after extensive use.
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